Abstract
The critical resolved shear stress (CRSS), τ 0, of peak-aged single crystals of the γ′-hardened commercial nickel-base superalloy NIMONIC 105 has been measured as a function of temperature T and orientation [hkl] of the compression axis. The same measurements have been carried out for the two constituent phases of NIMONIC 105: for the single-phase γ matrix and for the single-phase L12-long-range ordered γ′ phase. The value of T ranged from 283 to 1150 K, and the following orientations were studied: [001], [011], \([\bar 111]\), and \([\bar 123]\). The specimens were compression tested. The τ 0 values of NIMONIC 105 and of the γ′ phase are anisotropic; the anisotropy of NIMONIC 105 is similar to that of the γ′ phase, but less pronounced. The τ 0 of the γ phase is isotropic. The τ 0 values of the γ and of the γ′ phase vary with T, whereas the τ 0 of NIMONIC 105 is nearly independent of T for 400 K≤T≤1000 K. A model is presented that relates the function τ 0 ([h, k, l], T) of NIMONIC 105 to the analogous functions of its constituent γ and γ′ phase.
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Nitz, A., Nembach, E. The critical resolved shear stress of a superalloy as a combination of those of its γ matrix and γ′ precipitates. Metall Mater Trans A 29, 799–807 (1998). https://doi.org/10.1007/s11661-998-0271-2
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DOI: https://doi.org/10.1007/s11661-998-0271-2